/* Total size of all the indexes on each table, descending by size. */

SELECT c.relname AS table,
  pg_size_pretty(pg_indexes_size(c.oid)) AS index_size
FROM pg_class c
LEFT JOIN pg_namespace n ON (n.oid = c.relnamespace)
WHERE n.nspname NOT IN ('pg_catalog', 'information_schema')
AND n.nspname !~ '^pg_toast'
AND c.relkind IN ('r', 'm')
ORDER BY pg_indexes_size(c.oid) DESC;
